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AT45DB321D Datasheet(PDF) 14 Page - ATMEL Corporation

Part # AT45DB321D
Description  32-megabit 2.7-volt DataFlash
Download  55 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT45DB321D Datasheet(HTML) 14 Page - ATMEL Corporation

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14
3597H–DFLASH–02/07
AT45DB321D [Preliminary]
9.1
Sector Protection Register
The nonvolatile Sector Protection Register specifies which sectors are to be protected or unpro-
tected with either the software or hardware controlled protection methods. The Sector Protection
Register contains 64 bytes of data, of which byte locations 0 through 63 contain values that
specify whether sectors 0 through 63 will be protected or unprotected. The Sector Protection
Register is user modifiable and must first be erased before it can be reprogrammed. Table 9-3
illustrates the format of the Sector Protection Register.:
Note:
1. The default value for bytes 0 through 63 when shipped from Atmel is 00H.
x = don’t care.
Table 9-2.
Sector Protection Register
Sector Number
0 (0a, 0b)
1 to 63
Protected
See Table 9-3
FFH
Unprotected
00H
Table 9-3.
Sector 0 (0a, 0b)
0a
0b
Bit 3, 2
Data
Value
(Pages 0-7)
(Pages 8-127)
Bit 7, 6
Bit 5, 4
Bit 1, 0
Sectors 0a, 0b Unprotected
00
00
xx
xx
0xH
Protect Sector 0a (Pages 0-7)
11
00
xx
xx
CxH
Protect Sector 0b (Pages 8-127)
00
11
xx
xx
3xH
Protect Sectors 0a (Pages 0-7), 0b
(Pages 8-127)(1)
11
11
xx
xx
FxH


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